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There is plenty of info out here by searching teleconverter's. Tamron or Kenko are the brands. Based on the info and pricing you can decide. I would suggest Tamron because that's what I have always used. I posted examples of my testing with my 80-200 with the 2X in the images to share section.

For an a200 you need to use a Sony A mount teleconverter. As mentioned, there are several brands available - Sony, Tamron, Sigma, Kenko to name a few.

The deciding factor is actually what lenses you want to pair it with.

The Sony (and Minolta / Konica-Minolta) branded teleconverters only work with G series lenses (with a couple of exceptions). The Sigma brand Teleconverters generally only work with Sigma lenses. Kenko teleconverters work with any A mount lens.

Personally I own a sony 1.4x TC and a kenko 2.0x TC - both are very good.

From one of your earlier posts I see you have a tamron 55-300. It might be worth noting that TCs generally perform best with prime lenses (eg fixed focal length lenses, such as a 300mm f2. rather than superzooms - lenses with very large zoom ranges tend to have some compromises which TCs can acentuate... so you may want to try one in a camera store before commiting money to it